Erin's unnerved when someone breaks into her apartment, and then she discovers her coworker was attacked. Elsewhere, Jamie and Eddie find a pipe bomb in a senior citizen's home; and Frank investigates a charity that's supposedly helping the NYPD.

In the third-season opener, a criminal seeks revenge on Danny by abducting Jackie. Elsewhere, Jamie is assigned a new partner; and a young cop is unnerved after he mistakenly shoots an innocent person.